Depth of field for the Pentax HD PENTAX-D FA 21mm F2.4 ED Limited DC WR on the Pentax K-70 (1.53× crop, circle of confusion 0.020 mm). At 21 mm and f/8 the hyperfocal distance is 2.8 m — focus there and everything from 1.4 m to infinity is sharp.
Focal length
21 mm
32 mm FF equiv.
Hyperfocal @ f/8
2.8 m
9 ft
NPF wide open
9.6 s
f/2.4, 3.89 µm pixels
Horizontal FOV
58.4°
Depth of field chart at 21 mm
| Focus distance | f/2.8 | f/4 | f/5.6 | f/8 | f/11 | f/16 |
|---|---|---|---|---|---|---|
| 1 m | 0.89–1.1 m | 0.85–1.2 m | 0.80–1.3 m | 0.74–1.5 m | 0.68–1.9 m | 0.59–3.3 m |
| 2 m | 1.61–2.7 m | 1.48–3.1 m | 1.34–3.9 m | 1.18–6.7 m | 1.02–57.8 m | 0.83–∞ m |
| 3 m | 2.19–4.8 m | 1.96–6.4 m | 1.72–11.5 m | 1.46–∞ m | 1.22–∞ m | 0.96–∞ m |
| 5 m | 3.09–13.1 m | 2.66–42.8 m | 2.24–∞ m | 1.81–∞ m | 1.46–∞ m | 1.10–∞ m |
| 10 m | 4.47–∞ m | 3.61–∞ m | 2.88–∞ m | 2.20–∞ m | 1.70–∞ m | 1.24–∞ m |
| 20 m | 5.75–∞ m | 4.40–∞ m | 3.35–∞ m | 2.47–∞ m | 1.86–∞ m | 1.32–∞ m |
Each cell shows the near and far limits of acceptable sharpness.
Open the DoF calculator with this setup